Answer:
c. antagonism
Explanation:
The toxic effect is that produced by one or several toxic agents on an organism, population or community that is manifested by biological changes. Its degree is assessed by an intensity or severity scale and its magnitude is related to the dose (amount of substance administered, usually expressed per unit of body weight) or the concentration (substance applied in the medium) of the toxic agent.
The effect can be:
- Quantum: consisting of the presence or absence of a characteristic (eg death or existence of tumors).
- Lethal: death by direct action as a result of exposure to a certain concentration of a toxic agent.
- Sublethal: occurs below the level that causes death as a direct result of exposure to a certain concentration of a toxic agent.
- Acute: that caused by the action of chemical substances on living organisms, which manifests rapidly and severely (after a short period of exposure: 0 - 96 h, typically.).
- Chronic: one that occurs, in general, after a prolonged period of exposure (usually manifests after days or years, depending on the species).
- Additive: the magnitude of the effect or simultaneous response of two or more substances is equal to the sum of the effects or responses of each.
- Combined: when two or more substances applied at the same time produce different effects or have different modes of action.
- Enhancement or synergism: when the toxicity of a mixture of chemical agents is greater than expected by the simple sum of the toxicities of the individual agents present in the mixture.
- Inhibition or antagonism: when the toxicity of a mixture of chemical agents is lower than expected by the simple sum of the toxicities of the individual agents present in the mixture.
